Malicious PDF — malware analysis report

Static analysis result for SHA-256 88de222f84f00b05…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 02:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 847ef825ef630e698c859506abf1f0c4 SHA-1: 2471de70eeed205bc254d92c5ddb3cf6f9a01cbe SHA-256: 88de222f84f00b05902c45dafebac3fc5936bdab0b7efec501cfa18b2eae462b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=my+cam+app+for+android PDF link annotation
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905044648.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f48e18847---53892462660.pdfIn PDF document text
    • http://www.og2c.com/images/file/nimovujof.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/komugekukixaza.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/kuxojibujigoba.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/67249878765.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/13986206622.pdfIn PDF document text
    • https://nls.vn/upload/files/81773399773.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hk0ukubvgp3poc7ioars47sn5t/6032389457.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/kanokowexu.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/falijos.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/17374441957.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/8503634326.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/gepizum.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pisokafipawupobudu.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/67107975384.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613365a538975---38659584211.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/81374345534.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/talumez.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/livut.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/71954039621.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210921011050.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/36969927137.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC16 10444 bytes
SHA-256: 29e8cb711af581fa7d97b41fcc6e40f9fd0bef822f4fbc52af7ae25649f208cb
font_01_sfnt_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 15136 bytes
SHA-256: cca800efa724a891fb636b6ec3e82f3edfe0dd2ea6486f465f314cfdab77316a
font_02_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1